Is CD1A p.Ser277Cys (c.830C>G) pathogenic?

CD1A p.Ser277Cys (c.830C>G) is classified Uncertain significance in CD1A (ClinVar, Single submitter, 1 submitter; last evaluated 2025-04-14). AlphaMissense: likely benign (0.2045); Very rare (popmax 8.47e-05%, nfe).

How common is CD1A p.Ser277Cys (c.830C>G) in the general population?

CD1A p.Ser277Cys (c.830C>G) is very rare (popmax 8.47e-05%, nfe) (gnomAD).

What do computational predictors say about CD1A p.Ser277Cys (c.830C>G)?

AlphaMissense predicts likely benign (score 0.2045) — an in-silico prediction, not a clinical call.

CD1A p.Ser277Cys

c.830C>G · VCV3998038

Uncertain significance Single submitter

Classification

Uncertain significance

ClinVar

Review

Single submitter ★☆☆☆

ClinVar · 1 submitter

AlphaMissense

likely benign

0.2045 · ACMG-weighted

gnomAD v4.1

Rare

very rare (popmax 8.47e-05%, nfe)

Missense predictors

1/3 damaging

AlphaMissense, REVEL, SaProt

Computational evidence

Protein change
AlphaMissense	0.2045	likely benign
REVEL	0.093	moderately benign-leaning
SaProt	LLR -10.06	damaging
⇒ SaProt calls this damaging; AlphaMissense and REVEL do not.
Splicing
SpliceAI	—	not assessed · no allele here is in the release
Constraint at this position
Conservation	phyloP -0.74	GERP 1.9
Regional constraint	o/e 1.13	unconstrained · MANE · 3,017 bp · p 0.0086 · regional, not allelic
Overall
CADD	17.56	PHRED · no single calibrated threshold — expert panels disagree

AlphaMissense carries the ACMG weight for missense; REVEL and SaProt are independent agreement signals.

Population frequency

gnomAD v4.1 · exomes + genomes

Grpmax group 8.47e-05% European (non-Finnish) · 1/1,180,000 alleles

Overall 6.84e-05% 1/1,461,850 alleles · very rare

Rarity supports pathogenicity (ACMG PM2); frequency above a disease-specific BA1/BS1 threshold argues against it. A variant frequent in one ancestry group can be near-absent in others, so a single global figure can mislead.

Variant & gene context

Gene: CD1A
Protein: p.Ser277Cys
Coding: c.830C>G
MANE Select: NM_001763
Type: single nucleotide variant
Location: chr1:158257011 (GRCh38)
Gene constraint: LOEUF 1.644 · pLI <0.01 (gnomAD)
Structure: AlphaFold pLDDT 89.11 · 16 PDB
Residue 277: a disulfide bond; a β-strand; the ig-like domain

Full CD1A gene report on Sugi Atlas → Gene function, pathways, protein structure, interactions & more

Similar variants

CD1A c.605-3C>T Benign ★★ same type
CD1A p.Arg90Cys Benign ★★ ⚠ same type
CD1A p.Gly240Asp Likely benign ★★ ⚠ same type
CD1A p.Ala102Thr Uncertain significance ★ ⚠ same type
CD1A p.Ala196Glu Uncertain significance ★ ⚠ same type
CD1A p.Ala196Ser Uncertain significance ★ ⚠ same type
CD1A p.Ala264Pro Uncertain significance ★ ⚠ same type
CD1A p.Ala306Val Uncertain significance ★ ⚠ same type

Built on 18 open, versioned datasets — ClinVar, gnomAD, AlphaMissense, REVEL, ClinGen & more — plus Sugi Variant's own cross-source analysis. Source data 2026-01–2026-10, ClinVar 2026-10. Full sources & versions →

Cite Sugi Variant

Gür T. Sugi Variant: A Deterministic Per-Variant Germline Reference from a Knowledge Graph for Humans and AI Agents. 2026. doi:10.5281/zenodo.21509445. This variant: https://sugi.bio/variant/cd1a-p-ser277cys (accessed [today's date]).

Preprint & method: sugi.bio/variant/method Machine-readable: this page as Markdown